Badger Meter Research Control Valve - Manual (Page 13)

PCV - Pressure Control Valve
LCV - Level Control Valve
TCV - Temperature Control Valve
FCV - Flow Control Valve
Topworks (Actuator) - The assembly that provides force
Positioner - Instrument added or attached to topworks for more precise control
ATO - Air to Open. Increasing air signal opens valve
ATC - Air to Close. Increasing air signal closes valve
F/O - (Fail Open) Valve opens on air failure
N/O - (Normally Open) Valve opens on air failure
F/C - (Fail Close) Valve closes on air failure
N/C - (Normally Close) Valve closes on air failure
Body Bonnet Assy - That assembly consisting of body, bonnet, gasket, innervalve, stem, seat, packing,
gland and yoke nut
Trim Set - The interchangeable components in a set consisting of innervalve, stem and seat
=% - Equal Percentage. Lift versus flow characteristic
Lin. - Linear lift versus flow characteristics
Q.O. - Opening - ON-OFF service
P1 - lnlet pressure to valve
P2 - Downstream pressure from valve
HP - Delta P - Pressure drop across valve
C
v
- Flow Coefficient - Water flow at 1 PSI pressure drop
Chevron Rings - Packing, molded V-rings (normally 3 per set)
Braid Tef. - Packing, rope-type braided Teflon with Teflon suspensoid lubricant
TERMINOLOGY
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